blob: 21af155bba2e06d439565df7a09041a17e2aec62
| 1 | /* |
| 2 | * FFV1 decoder template |
| 3 | * |
| 4 | * Copyright (c) 2003-2016 Michael Niedermayer <michaelni@gmx.at> |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | static av_always_inline void RENAME(decode_line)(FFV1Context *s, int w, |
| 24 | TYPE *sample[2], |
| 25 | int plane_index, int bits) |
| 26 | { |
| 27 | PlaneContext *const p = &s->plane[plane_index]; |
| 28 | RangeCoder *const c = &s->c; |
| 29 | int x; |
| 30 | int run_count = 0; |
| 31 | int run_mode = 0; |
| 32 | int run_index = s->run_index; |
| 33 | |
| 34 | if (s->slice_coding_mode == 1) { |
| 35 | int i; |
| 36 | for (x = 0; x < w; x++) { |
| 37 | int v = 0; |
| 38 | for (i=0; i<bits; i++) { |
| 39 | uint8_t state = 128; |
| 40 | v += v + get_rac(c, &state); |
| 41 | } |
| 42 | sample[1][x] = v; |
| 43 | } |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | for (x = 0; x < w; x++) { |
| 48 | int diff, context, sign; |
| 49 | |
| 50 | context = RENAME(get_context)(p, sample[1] + x, sample[0] + x, sample[1] + x); |
| 51 | if (context < 0) { |
| 52 | context = -context; |
| 53 | sign = 1; |
| 54 | } else |
| 55 | sign = 0; |
| 56 | |
| 57 | av_assert2(context < p->context_count); |
| 58 | |
| 59 | if (s->ac != AC_GOLOMB_RICE) { |
| 60 | diff = get_symbol_inline(c, p->state[context], 1); |
| 61 | } else { |
| 62 | if (context == 0 && run_mode == 0) |
| 63 | run_mode = 1; |
| 64 | |
| 65 | if (run_mode) { |
| 66 | if (run_count == 0 && run_mode == 1) { |
| 67 | if (get_bits1(&s->gb)) { |
| 68 | run_count = 1 << ff_log2_run[run_index]; |
| 69 | if (x + run_count <= w) |
| 70 | run_index++; |
| 71 | } else { |
| 72 | if (ff_log2_run[run_index]) |
| 73 | run_count = get_bits(&s->gb, ff_log2_run[run_index]); |
| 74 | else |
| 75 | run_count = 0; |
| 76 | if (run_index) |
| 77 | run_index--; |
| 78 | run_mode = 2; |
| 79 | } |
| 80 | } |
| 81 | run_count--; |
| 82 | if (run_count < 0) { |
| 83 | run_mode = 0; |
| 84 | run_count = 0; |
| 85 | diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], |
| 86 | bits); |
| 87 | if (diff >= 0) |
| 88 | diff++; |
| 89 | } else |
| 90 | diff = 0; |
| 91 | } else |
| 92 | diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits); |
| 93 | |
| 94 | ff_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n", |
| 95 | run_count, run_index, run_mode, x, get_bits_count(&s->gb)); |
| 96 | } |
| 97 | |
| 98 | if (sign) |
| 99 | diff = -diff; |
| 100 | |
| 101 | sample[1][x] = av_mod_uintp2(RENAME(predict)(sample[1] + x, sample[0] + x) + diff, bits); |
| 102 | } |
| 103 | s->run_index = run_index; |
| 104 | } |
| 105 | |
| 106 | static void RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3]) |
| 107 | { |
| 108 | int x, y, p; |
| 109 | TYPE *sample[4][2]; |
| 110 | int lbd = s->avctx->bits_per_raw_sample <= 8; |
| 111 | int bits = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8; |
| 112 | int offset = 1 << bits; |
| 113 | |
| 114 | for (x = 0; x < 4; x++) { |
| 115 | sample[x][0] = RENAME(s->sample_buffer) + x * 2 * (w + 6) + 3; |
| 116 | sample[x][1] = RENAME(s->sample_buffer) + (x * 2 + 1) * (w + 6) + 3; |
| 117 | } |
| 118 | |
| 119 | s->run_index = 0; |
| 120 | |
| 121 | memset(RENAME(s->sample_buffer), 0, 8 * (w + 6) * sizeof(*RENAME(s->sample_buffer))); |
| 122 | |
| 123 | for (y = 0; y < h; y++) { |
| 124 | for (p = 0; p < 3 + s->transparency; p++) { |
| 125 | TYPE *temp = sample[p][0]; // FIXME: try a normal buffer |
| 126 | |
| 127 | sample[p][0] = sample[p][1]; |
| 128 | sample[p][1] = temp; |
| 129 | |
| 130 | sample[p][1][-1]= sample[p][0][0 ]; |
| 131 | sample[p][0][ w]= sample[p][0][w-1]; |
| 132 | if (lbd && s->slice_coding_mode == 0) |
| 133 | RENAME(decode_line)(s, w, sample[p], (p + 1)/2, 9); |
| 134 | else |
| 135 | RENAME(decode_line)(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1)); |
| 136 | } |
| 137 | for (x = 0; x < w; x++) { |
| 138 | int g = sample[0][1][x]; |
| 139 | int b = sample[1][1][x]; |
| 140 | int r = sample[2][1][x]; |
| 141 | int a = sample[3][1][x]; |
| 142 | |
| 143 | if (s->slice_coding_mode != 1) { |
| 144 | b -= offset; |
| 145 | r -= offset; |
| 146 | g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2; |
| 147 | b += g; |
| 148 | r += g; |
| 149 | } |
| 150 | |
| 151 | if (lbd) |
| 152 | *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24); |
| 153 | else if (sizeof(TYPE) == 4) { |
| 154 | *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = g; |
| 155 | *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = b; |
| 156 | *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r; |
| 157 | } else { |
| 158 | *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b; |
| 159 | *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g; |
| 160 | *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r; |
| 161 | } |
| 162 | } |
| 163 | } |
| 164 | } |
| 165 |